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DHCP server on Windows network

Posted on 2013-05-29
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Last Modified: 2013-05-29
What is the point in authorising a Windows DHCP server. If I have client machines joined to a domain, they will obviously retrieve DHCP addresses from the authorised DHCP server. If someone puts a rogue DHCP server on the network will my client machines get an IP from the rogue machine or how should I stop this. thanks
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Question by:Sid_F
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by:Chris
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These pages explain DHCP server authorisation pretty well.

http://technet.microsoft.com/en-us/library/dd296633%28v=ws.10%29.aspx

http://technet.microsoft.com/en-us/library/cc737140%28v=ws.10%29.aspx

It basically prevents unwanted Windows DHCP servers from running on your network. Unfortunately this doesn't apply to non-windows DHCP servers so it's usefulness is somewhat limited.
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by:Sid_F
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ok but if I have a client joined to a domain which has an authorised dhcp server how will the client know to only use that dhcp server.
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Chris earned 500 total points
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The client doesn't know which to use, it just sends out a broadcast request and waits for a reply from whichever DHCP server replies first.

The way it works is that when a Windows DHCP server starts up, it checks if it's authorised. If its not authrorised then it won't serve any clients. This way, in theory, the only DHCP servers that are active will be ones you've authorised in AD.

As i mentioned above though, non-windows DHCP servers don't check for authorisation, so this is only effective at preventing rogue Windows DHCP servers.
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